Malicious PDF — malware analysis report

Static analysis result for SHA-256 b97112c5aa3831e0…

MALICIOUS

PDF

88.5 KB Created: 2021-09-04 19:29:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 72208e57227e1e1fee19b6ad61a4ffe2 SHA-1: 49d2e1d94e4f7145832a3f679491b59a5e9deed7 SHA-256: b97112c5aa3831e039700625f27246851cd3f159d548dc22fe24f1dd5c284d4f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs hosted on various domains, some of which appear to be compromised WordPress sites. The presence of PDF_URI_IP_LITERAL suggests direct IP addressing, which is often used to bypass domain-based filtering. While no scripts were explicitly extracted, the nature of the links and the PDF structure suggest it is designed to lure users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://canadapremiumlubes.com/survey/userfiles/files/87758945108.pdf In PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/16393995350.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c407aaa1410---57011730351.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608669b36b020---nedukaxoletovoveguxin.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93133562232.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/dofuzimimupupaluf.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/7qtn7lq2nbv4pum2gmvkhbhh0h/fufekavazadixixodagiluror.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/tapamexi.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/jakowifewopobowekujinor.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/47f874e83b9c9d7473a1599690470ac9/roniwemixaxumiboz.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/61428193822.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613334049f6a2---jawiliwuvibaxadefigif.pdfPDF link annotation
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/3dfdebb336fbf45778ff6ab48656da69/9095286888.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db48ddff7f---8838427830.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9642b130d---42752709346.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/172112473.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/86fbe2428ce0c6b1e389eb6c27910637/labapeka.pdfIn PDF document text
    • http://labotinnghia.com/img/files/22901792848.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/gejegoweliduga.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/xawowotipu.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/vitorasa.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/foxomotikudipawabizetik.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160703b5a95789---wosupofobut.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5c17d643e---fagimogedadasovisurabuta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=reported+speech+statements+%C3%BCbungen+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10344 11408 bytes
SHA-256: 5ce5dc01f0f2a70217713b57966720346d966696b1d26f951fe0c5f790007a1a
font_02_sfnt_off00011d47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D47 20432 bytes
SHA-256: be9e9fee477dbf11b7b3b0b634adf406ce702213f549574b9629ddd48869af59

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